Feature: 1. [Multiple Receiver Support] This wireless ear return system supports one transmitter to multiple receivers. This makes it ideal for bands, choirs, or any group performances where multiple members need to listen the same sound feed. 2. [Real Time, No Latency Transmission] Utilizing UHF high frequency transmission, this system offers real time, no latency sound delivery. This ensures that performers can hear the sound feed exactly when it's happening, which is crucial for timing and synchronization during performances. 3. [Wide Wireless Range] With a large wireless transmission range, this system offers plenty of flexibility for performers to move around. This allows for more dynamic and engaging performances without being restricted by cables. 4. [Versatile Sound Output Support] This wireless IEM system supports a wide range of sound outputs including sound cards, mixing consoles, headphone amplifiers, mobile phones, and computers. This makes it a versatile solution for various sound setups and requirements. 5. [Compact and Portable] The compact and portable design of the receiver allows it to be easily clipped onto clothing or placed in a pocket. This ensures that performers can move freely without being encumbered by bulky equipment. The system also features a one key frequency switch for easy operating. Specification: Item Type: Ear Return System Material: Plastic Modulation Mode: Digital Frequency Modulate Frequency Range: UHF 630-690MHz Preset Frequencies: 8 (auto paring) Frequency Response: 75Hz-18kHz±3dB Maximum Deviation Range: ±50kHz (with level limiting) T.H.D.: Less Than 1.0 Percent at 1kHz S, N: More Than 98dB Working Range: Up to 30m/98ft RF Carrier Stability: ±0.005%(-10℃ to 50℃) Product Size: 7 x 3.4 x 1.9cm / 2.7 x 1.3 x 0.7in Receiver: Mode of Transmission: Mono Power Supply: 3.7V Power Consumption: 500mA (Included) Battery Life: 4.5 hours Transmitter: Power Consumption: 500mA (Included) Power Supply: 3.7V Mode of Transmission: Mono Frequency Setting: Manual Key Setting Battery Life: 4.5 hours. Package List: 1 x Receiver 1 x Transmitter 1 x Charging Cable 1 x Portable Bag 1 x Earphones 2 x Pairs of Spare Earplug 1 x Transmission Cable Note: 1. UHF high frequency without delay. 2. Mono channel, with mid tone as the main focus. 3. Not applicable for the purpose of listening to music. 4. Sound card close range live streaming not applicable.5. Manual measurement, please allow some errors.